Dashpot relay



March 19, 1929. H. sENGr-:BUscl-l 1,706,188

` DAsHPoT RELAY original Filed Oct. 4, 1923 Haz-z5) 5er-1515137.15521 Ydashpot and takes place,

Patented Mar. 19, 1929.

UNTE. STATES P'ENT HANS SENGEBUSCH, 0F CI-ICAGO, ILLNOIS, ASSIGNGR, BY MES-LNE ASSIGNMENTS, T)

AUTOM'A'IIC ELECTRC NC., OF CHCAGO, ELLNOIS, COB-ORATON OF :DELA- WARE.

DASHPOT RELAY.

Application filed October 4, 1923, Serial This invention relates in general to dashpot relays and its object, broadly stated, is to provide a new and improved dashpot for a relay of this type. More specifically, the principal object of the invention is to provide a dashpot in which the slow action can be regulated from the outside'and without dismounting or disassembling any of the parts.

To accomplish the foregoing and other useful endsthis invention comprises means which will be fully described in the specilication which is to follow, reference being had to the accompanying drawing, in which Fig. 1 is a perspective view of the entire relay; Fig. 2 is a vertical Jiront view of the relay, partly in section, with the dashpot tension plate and spring assembly cap or cover removed; F ig. 3 is a perspective view of the cover for the relay springs; Fig. 4 is a-top view of the piston; F ig. 5 is a vertical cross section of the solenoid spool and its associated equipment; and Fig. 6 is a top view ot the dashpot cap orcoupling.

rIhe dashpot relay illustrated comprises essentially anoperating magnet, a solenoid in this case, a set of contact springs adapted to be operated by the solenoid plunger rod, and a dashpot tor delaying or slowing up the operation of theplunger when it is attracted. The release of the plunger, it may be stated, is not? delayed appreciably by the therefore, very general type are need not be described in detail, except in so tar as the new features are involved. It may be mentioned, however, that a dashpot relay is used in a circuit where delayed operation or slow action is required, as for example where it is desired to operate an alarm or other signal after the expiration of a predetermined time interval.

The mounting bracket 2, as shown in Figs. l and 2, is cast metal, finished and tapped for mounting with screws, the heel piece 3 tension plate 4, cap or coupling 5, and for being itself mounted in an'upright position by screws passing through staggered screw holes, one of which is shown as 6 in Fig. 1. The top or extended portion of the bracket has a hole drilled through it to accommodate the extension of the solenoid tube or sleeve 7, as shown in Fig. 5.

quickly. Relays ot' this well understood .and

No. 666,655. Renewed January 18, 1926.

The heel piece 3, shown in Figs. 1 and 2, is a metal strip bent and tapped for mounting the spring assembly 8. It is drilled to accommodate the core 9, and insulating bushings at its` upper end through which are taken terminals for making connections. The outside or clamping member of the spring assembly 8 is extended to act as a spring to hold the bakelite cover 36 in place as shown in Fig. 1. rl`his cover is shown more indetail in Fig. 3 and it acts to protect the springs and contacts from dirt or other injury.

The dashpot assembly consists of two metal cylinders 11 and 12 with a needle valve l5 at the bottom and between them, which is held in place by means of the coil spring 16, as best shown in Fig. 2. The inner cylinder 12 is drilled out to acco1nmodate the piston numbered 13, la, etc., and has a needle valve aperture 21 drilled in the bottom, and an outlet hole 22 drilled in the side. 'lhe outer cylinder 11 is drilled out to accommodate the inner cylinder 12 and hold the oil, or other suitable liquid, which iiows through the inner cylinder an d control the latters action.

The cap or coupling 5, shown in Figs. 2 and 6, has its sides threaded to hold the two cylinders, and has its top drilled with holes 29, 30 and 33 so as to be fastened to mounting plate 2 by means of screws, to permit free movement of the plunger red 17, and to aeconnnodate the spring' lever 20, respectively. The cap also has a slot 31 cut in its top to acconnnodate the spring 20, and a pin 32 to help hold said spring.

The plunger rod 17 the solenoid is connected to the piston rod 18 by means of a combination coupling and spring control member 19, the connection being made by a screw 27 and split washer 28, as shown in F ig. 2. The coupling and spring control member 19 has a collar at its upper end which strikes the lower end ot the spring lever 2O and causes it to operate and control the springs in spring assembly 8.

The solenoid spoel assembly consists of a non-magnetic metal tube or sleeve 7, as best shown in Fig. 5, with a'rat-her heavy piece of fibre at its upper end and a light nbre strip 35 at its lower end, resting against the mounting bracket 2 to insulate the winding therefrom. The sleeve extends through the piston to vcone-shaped construction of the core and plunger rod.

r1`he piston assembly consists of a vertical cylindrical member 141 with a valve aperture 23 in its base, in front of which the ball valve 24 operates, as shown in Fig. 2. The piston has a cap or cover plate 13, as shown in Figs. 2 and 4f, which is held in place by screws 25, and which has six holes 26 for the lree passage of oil during either movement of the piston.

Having briefly explained the purpose of the invention and the apparatus involved in carrying it out, its operation may now be explained more in detail. For this purpose it will be assumed that the relayr is connected in a circuit of correct voltage and that the dashpot is filled with the proper amount and kind of oil, the amount in this case being such as lto always keep the outlet 22 submerged. n

When the solenoid 10 is energized, the plunger rod 17 is attracted to raise the piston 13, 14,' etc., against the vacuum created in the bottom otl the vvcylinder 12. The needlevalve aperture 21 now entirely controls the flow of oil through the cylinder and makes the piston slow to pull up, its speed depending upon the size -of the aperture which is regulated by screwing up ory unscrewing the outer cylinder 11 which holds the needle7 valve 15. As the p iston raises an amount ot oil equal to that .sucked through the needle7 valve aperture `flows back through the relatively large outlet 22. The' desired slow operation is completed when'the contacts of the springs in the assembly 8 are closed by the spring lever 2O through contact with the collar of the coupling 19 in its upward movement. The piston remains` in its pulled. up or operated d position as long as the solenoid lOrremains energized.

' llVhen'the solenoid 10 is deenergized, the solenoid plunger rod `17 is released and falls down by gravity, thereby allowing the coupling 19, piston rod 18 and piston 13, 111, etc. to also fall. The coupling 19 in falling releases the spring lever 20, which in turn allows the springs in assembly 8 to return lto. normal.V The piston in falling allows the oil .to unseat the ball if'alve 24 and rush through the rather large aperture 23 and openings 26, thus making it quick to restore.

The .principal advantages fin a dashpot constructed in the manner described in the foregoing are, that the adjustment of the slow action valve is controlled from the outside, and that the oil cannot leak out.

Having described my invention, what I consider to be new and desire to have protected by Letters Patent will 'be pointed out in` the appended claims.

That I claim is:

1.YThe combination, in a dashpot relay, of aninner cylinder containing a piston and having a valve aperture in its base and an outlet hole in its side, with an outer cylinder containing said inner cylinder and a needle valve 'for regulating said valve aperture, all substantially as set forth. j

2. lua dashpot relay, the combination of an innercylinder havingV a piston and a valve aperture, with an outer cylinder having a needle valve, said outer cylinder being adjustable, thus causing ksaid needle valve to regulate the size of said valve aperture and control the slow' action of said piston, substantially as described.

3. In a dashpot relay, the combination et a cylinder within a cylinder having a Slow acting valve between them, with a coupling 'for joining and spacing'said cylinders so as to regulate said valve to the desired slow action, substantially as described. Y

4l. ln a dashpot, a piston having a relatively large valve aperture closed when the piston is raised, an inner cylinder having a small valve aperture in its base and an outlet aperture in its side which are always open, a ball valve lfor closing said large valve aperture, a needle valve for regulating said small valve aperture, and an outer cylinder enclosing all and being capable of adjusting lsaid needle valve.

5. In a'l dashpot, a container, a pump inside said container and comprising a piston and cylinder, said cylinder-'having an opening in the bottom thereof', means for regulating the size of said opening to regulate the'speed of the piston when the same is raised, and means-tor adjusting said regulating means `from the outside of said container. I

6. In a relay, a dash pot, a reservoir for holding Fluid Jiorretarding the operation of saidrelay, a plunger containinor a ball valve, said plunger being located within said dash pot and being etlective upon energization of said relay to pump said fluid `from one part o1l the dash potto another, and a needle valve in said dash'pot tor regulating said pumping action.

7. lnV combination with a relay using fluid to retard its action, a dash pot mechanism comprising two separate chambers for said fluid including a ball valve cooperating with a needle valve for regulating the action of said relaja-said needle valve being located between said chambers and used for controlllO CIK

ling the flow of fluid from one chamber to the other.

8. In a dash pot type of slow acting relay using fluid to retard its action and comprising two separate chambers for said fluid, an adjustable needle valve cooperating with a ball valve for regulating the electiveness of the retarding'action, said needle valve being located between said chambers and used for controlling the flow of fluid from one chamber to the other.

9. In a dash pot mechanism, a cylinder, a

f piston within said cylinder provided with a valve effective t0 retard the movement of the piston in one direction only, a second cylinder, an opening connecting` the iirst cylinder with the second, and means con; trolled by the second cylinder for reeulating the size of the opening to further affect the action of said piston.

l0. In a dash pot mechanism, a cylinder, a piston within said cylinder, a second cylinder, an openinf connectingA the two, the size of the opening directly aliecting the speed of operation of said piston, and means operated by the rotation or' one of said cylinder for regulating the size orl the opening.

11. In a dash pot relay a solenoid spool assembly, a heel piece, a non-magnetic sleeve, a tight fitting magnetic core within the upper section or said sleeve and having its lower end drilled out to form a hollow cone, and a movable core in the lower section of said sleeve having its upper end shaped into a solid cone to increase the magnet-ic attraction for the plunger by shortening the air gap between the plunger and the heel piece.

l2. In combination with a dash pot slow acting relay, a llanged coupling member fastened to said relay, an outer cylinder threaded to the outside of said member, an inner'cylinder threaded to the inside of said member, a piston in said inner cylinder operated by said relay, a ball valve in said piston cooperating with a needle valve arranged between said cylinders, a fluid in said cylinders for retarding the action of said piston, and means turning said outer cylinder on said coupling member for regulating said needle valve to adjust the flow of fluid between said cylinders and regulate the action of said relay.

In witness whereof, I hereunto subscribe my name this 2d day of October, A. D., 1923.

HANS SENGEBUSCH. 

